[ 129 3 . 
Beridge (fome time a Watch-maker at Bofton) under 
the fame Inventor’s Direction, made and carried up 
to Town a Machine fomewhat of this fort, which 
feverai of your Members may have feen, yet I truft 
this Account may not be unacceptable. I am 
Tour moft affectionate humble Servant, 
M. Johnfon. 
A Ttefcription of the Metal Thermometer in the 
Mufeum of the Gentlemens Society at Spalding 
in Lincolnfhire* 
I T is compofed of an upright Staff or Bar (a) of 
the bed Iron, four Feet long, and an Inch and 
a Quarter broad, having a poliffi’d brafs Bar of the 
fame Length and Width fcrew’d to it before it, with 
four Steel Screws, and being alfo capp’d ( b ) with 
Steel, and thereon a Lever (c) moving upon a Stud 
of Steel, which communicates with another lefs 
Lever (d) (alfo upon a Stud) having a Chain ( e ) at 
the End of it, which laps round an Axis ( f ), whereto 
the Index is fixed, which fhcws the Degrees marked - 
on a femicircular Arch (g) : Under the Steel Screw- 
Heads there are fmall Slits in the Brafs Bar (except 
the lowermoft which is fixed) which admit of its 
expanding, whereby it protrudes and operates on the 
firft-mention’d Lever, which being raifed moves the 
lefs Lever, and thereby draws the Chain which 
turns the Axis affixed to the Index, which ffiews the 
v R Decree 
